2. Sample Papers
  3. 9th Class
  4. Science

9th Class Science Sample Paper Science Olympiad Model Test Paper-14

  • question_answer
    Which one of the following is the reason for causing AIDS?

    A) Reduction in number of helper T - cells

    B) Reduction in number of killer T - cells

    C) Autoimmunity

    D) Non Production of interferons

    E) None of these

    Correct Answer: A

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